/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.plan.execution.memory;

import com.google.common.util.concurrent.ListenableFuture;
import org.apache.commons.lang3.Validate;
import org.apache.iotdb.commons.exception.IoTDBException;
import org.apache.iotdb.db.mpp.execution.exchange.ISourceHandle;
import org.apache.iotdb.mpp.rpc.thrift.TFragmentInstanceId;
import org.apache.iotdb.rpc.TSStatusCode;
import org.apache.iotdb.tsfile.read.common.block.TsBlock;
import org.apache.iotdb.tsfile.read.common.block.column.TsBlockSerde;

import java.io.IOException;
import java.nio.ByteBuffer;

import static com.google.common.util.concurrent.Futures.immediateFuture;

public class MemorySourceHandle implements ISourceHandle {

    private final TsBlock result;
    private boolean hasNext;

    private static final TsBlockSerde serde = new TsBlockSerde();

    public MemorySourceHandle(TsBlock result) {
        Validate.notNull(result, "the TsBlock should not be null when constructing MemorySourceHandle");
        this.result = result;
        this.hasNext = true;
    }

    @Override
    public TFragmentInstanceId getLocalFragmentInstanceId() {
        throw new UnsupportedOperationException();
    }

    @Override
    public String getLocalPlanNodeId() {
        throw new UnsupportedOperationException();
    }

    @Override
    public long getBufferRetainedSizeInBytes() {
        throw new UnsupportedOperationException();
    }

    @Override
    public synchronized TsBlock receive() {
        hasNext = false;
        return result;
    }

    @Override
    public synchronized ByteBuffer getSerializedTsBlock() throws IoTDBException {
        hasNext = false;
        if (result.isEmpty()) {
            return null;
        } else {
            try {
                return serde.serialize(result);
            } catch (IOException e) {
                throw new IoTDBException(e, TSStatusCode.TSBLOCK_SERIALIZE_ERROR.getStatusCode());
            }
        }
    }

    @Override
    public synchronized boolean isFinished() {
        return !hasNext;
    }

    @Override
    public ListenableFuture<?> isBlocked() {
        return immediateFuture(null);
    }

    @Override
    public boolean isAborted() {
        return false;
    }

    @Override
    public void abort() {
    }

    @Override
    public void abort(Throwable t) {
        abort();
    }

    @Override
    public void close() {
    }

    @Override
    public void setMaxBytesCanReserve(long maxBytesCanReserve) {
    }
}
